Tag: methods of separation

Questions Related to methods of separation

State a method to separate liquid-liquid mixture having different boiling points.

separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

  1. Evaporation

  2. Separating funnel

  3. Fractional distillation

  4. Distillation

Show answer
Correct Option: C
Explanation:

To separate a liquid-liquid mixture having different boiling points, fractional distillation can be used.

Which of the following is a method for separation of gases?

separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

  1. Diffusion

  2. Liquefaction

  3. Centrifugation

  4. Solubility in a Solvent

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Correct Option: A,B,D
Explanation:

A mixture of two gases can be separated by diffusion, liquefaction and solubility in a solvent.

 Gas separation in membranes occurs due to differences in ______of the species flowing through the membrane.

separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

  1. Permeabilities

  2. Number of atoms

  3. Weight

  4. All of above

Show answer
Correct Option: A,C
Explanation:

Gas separation is an important unit operation employedwidely throughout the chemical industries. Gas separation in membranes occurs due to differences in permeabilities of the species flowing through the membrane.

A single container wherein the enrichment process takes place through gaseous diffusion is called

separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

  1. Divider

  2. Diffuser

  3. Stalk

  4. Rotator

Show answer
Correct Option: B
Explanation:

In a box with a semi-permeable membrane containing a mixture of two gases, the lighter molecules will pass out of the container more rapidly than the heavier molecules. The gas leaving the container is somewhat enriched in the lighter molecules, while the residual gas is somewhat depleted. A single container wherein the enrichment process takes place through gaseous diffusion is called a diffuser.

Which of the following are the drawbacks of gaseous diffusion methods for separation of gases?

separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

  1. Making and maintaining a suitable barrier

  2. Large energy consumption

  3. Long equilibrium times

  4. All of above

Show answer
Correct Option: D
Explanation:

Gaseous diffusion is unlikely to be the preferred technology of a proliferator due to difficulties associated with making and maintaining a suitable barrier, large energy consumption, the requirement for procuring large quantities of specialized stage equipment, large in-process inventory requirements, and long equilibrium times.

In a box with a semi-permeable membrane containing a mixture of two gases

separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

  1. The heavier molecules will pass out of the container more rapidly than the lighter molecules

  2. The lighter molecules will pass out of the container more rapidly than the heavier molecules

  3. Both heavier and lighter pass out of the container at equal rates

  4. Both a and c

Show answer
Correct Option: B
Explanation:

In a box with a semi-permeable membrane containing a mixture of two gases, the lighter molecules will pass out of the container more rapidly than the heavier molecules. The gas leaving the container is somewhat enriched in the lighter molecules, while the residual gas is somewhat depleted. 

Which of the following is commonly used for removing the water layer from a system containing oil and water?

separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

  1. Thermometer

  2. Separatory funnel

  3. Fiame spectrophotometer

  4. Burette

  5. Volumetric flask

Show answer
Correct Option: B
Explanation:

Water and oil are immiscible and they form two separate layer, oil have less density than water, so it floats on the water surface so, the water and oil layer can easily be separated by the separatory funnel.

Which statement explains why oxygen can be separated from nitrogen by the fractional distillation of liquid air?

separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

  1. Oxygen is more dense than nitrogen

  2. Oxygen is more reactive than nitrogen

  3. The two elements have different boiling points

  4. The two gases are in different groups of the Periodic Table

Show answer
Correct Option: C
Explanation:

Fractional distillation is a process of separation of mixtures based on the difference in their boiling points.

so, oxygen and nitrogen can be separated by fractional distillation because they have different boiling points.

Which of the following processes enable pure water to be obtained from seawater?
I filtration
II distillation
III evaporation

separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

  1. I and II only

  2. I and III only

  3. II and III only

  4. I,II and III

Show answer
Correct Option: C
Explanation:

Distillation and evaporation enables pure water to obtained from seawater,

both these process includes the evaporation of water and then condensing the water vapours to obtain pure form of water.

During distillation, some porcelain chips are added to the mixture being distilled to ______________.

separation of components of mixtures methods of separation elements, compounds and mixtures chemistry

  1. make the distilling flask more stable

  2. purify the mixture

  3. raise the temperature

  4. make the boiling smoother

Show answer
Correct Option: A
Explanation:

Procelain chips are added to the mixture for two reasons: to prevent the superheating of liquid and to make the distilling flask more stable.